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Minimum Three-Wire Interface with Software Protocol
With a three-wire interface, the software (as compared to interface
hardware) controls the data flow between the Logic Analysis System and the
controller. Because the three-wire interface provides no hardware means to
control data flow between the controller and the Logic Analysis System, only
XON/OFF can control this data flow. The three-wire interface provides a
much simpler connection between devices since you can ignore hardware
handshake requirements.
The communications software you are using in your computer/controller must
be capable of using XON/XOFF exclusively in order to use three-wire interface
cables. For example, some communications software packages can use
XON/XOFF but also depend on the CTS and DSR lines being true to
communicate.
The Logic Analysis System uses the following connections on its RS-232-C
interface for three-wire communication:
•
Pin 5 SGND (Signal Ground)
•
Pin 3 TD (Transmit Data from Logic Analysis System)
•
Pin 2 RD (Receive Data into Logic Analysis System)
The TD (Transmit Data) line from the Logic Analysis System must connect to
the RD (Receive Data) line on the controller. Likewise, the RD line from the
Logic Analysis System must connect to the TD line on the controller.
Internal pull-up resistors in the Logic Analysis System assure the DCD, DSR,
and CTS lines remain high when you are using a three-wire interface.
Programming Over RS-232-C
Minimum Three-Wire Interface with Software Protocol
3–4
Summary of Contents for 16501A LOGIC
Page 2: ...ii ...
Page 12: ...Contents 8 ...
Page 14: ......
Page 15: ...1 Introduction to Programming ...
Page 38: ...1 24 ...
Page 39: ...2 Programming Over HP IB ...
Page 45: ...3 Programming Over RS 232 C ...
Page 55: ...4 Programming Over LAN ...
Page 68: ...4 14 ...
Page 69: ...5 Programming and Documentation Conventions ...
Page 81: ...6 Message Communication and System Functions ...
Page 91: ...7 Status Reporting ...
Page 93: ...Figure 7 1 Status Byte Structures and Concepts Status Reporting 7 3 ...
Page 97: ...Figure 7 2 Service Request Enabling Status Reporting Key Features 7 7 ...
Page 100: ...Figure 7 3 Parallel Poll Data Structure Status Reporting Parallel Poll 7 10 ...
Page 105: ...8 Error Messages ...
Page 110: ...8 6 ...
Page 112: ......
Page 113: ...9 Common Commands ...
Page 116: ...Figure 9 1 Common Commands Syntax Diagram Common Commands 9 4 ...
Page 122: ...Figure 9 2 IST Data Structure Common Commands IST Individual Status 9 10 ...
Page 132: ...9 20 ...
Page 133: ...10 Mainframe Commands ...
Page 135: ...Figure 10 1 Mainframe Commands Syntax Diagram Mainframe Commands 10 3 ...
Page 136: ...Figure 10 1 continued Mainframe Commands Syntax Diagram continued Mainframe Commands 10 4 ...
Page 159: ...11 SYSTem Subsystem ...
Page 161: ...Figure 11 1 System Subsystem Commands Syntax Diagram SYSTem Subsystem 11 3 ...
Page 172: ...11 14 ...
Page 173: ...12 MMEMory Subsystem ...
Page 175: ...Figure 12 1 MMEMory Subsystem Commands Syntax Diagram MMEMory Subsystem 12 3 ...
Page 198: ...12 26 ...
Page 199: ...13 INTermodule Subsystem ...
Page 201: ...Figure 13 1 Intermodule Subsystem Commands Syntax Diagram INTermodule Subsystem 13 3 ...
Page 216: ...13 18 ...
Page 217: ...14 TGTctrl Subsystem ...
Page 219: ...Figure 14 1 Targetcontrol Subsystem Commands Syntax Diagram TGTctrl Subsystem 14 3 ...
Page 220: ...Figure 14 1 continued Targetcontrol Subsystem Commands Syntax Diagram TGTctrl Subsystem 14 4 ...
Page 233: ...Part 3 15 Programming Examples 15 1 Programming Examples ...
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Page 235: ...15 Programming Examples ...